| Symbol | Name | Element |
| F1 | Color moments in HSV space | [M1, M2,M3] | F2 | Statistical features of gray-scale image | [s1, s2,s3, s4,s5, s6,s7] | F3 | Statistical features of the gray-level co-occurrence matrix | | F4 | Local binary pattern histogram | [b1, b2,b3, b4,b5, b6,b7,b8,b9,b10,b11, b12,b13, b14,b15, b16,b17,b18] | F5 | Statistical features of wavelet transform decomposition | [W1,W2,W3,W4,W5,W6,W7] | F6 | Combinatorial features | [F1, F2] | F7 | Combinatorial features | [F3, F4] | F8 | Combinatorial features | [F1, F2, F3, F4] | F9 | Combinatorial features | [F1, F2, F3, F4, F5] |
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